The Shure BLX14/PGA31 Wireless Headset System combines professional-quality sound with simple setup and up to 14 hours battery life for great audio performance right out of the box. The system includes BLX4 tabletop single-channel receiver, PGA31 headset microphone with BLX1 bodypack transmitter, clothing clip, power supply, 2 AA batteries, windscreens, and user guide.